Lens-edging machine



5 Sheets-Sheet l E; M.I LONG LENS EDGING MACHINE Filed March 50, 1925 Jan. 31, 1928.

Jan. 31, 1928.

E. M. LONG LENS EDGING MACHINE Filed March 3Q. 1925 5 Sheets-Sheet 2 ATTORNEY.

Jam.V 31x, v

E. M. LONG LENS EDGING MACHINE sheets-sheet s Filed Maxjoh 30, 1923 4 1 v NToR Q e ATTRNEY.

Jan. 3l, 1928.

E. M. LONG LENS EDGING MACHINE 5 Sheets-Sheet 4 Filed March 50, 1923 \NvENToR ATTORNEY Jan. 31, 1928. 1,657,720

.12. M. LONG LENS EDGING MACHINE Filed March 30, 1923 5 Sheets-Sheet 5 Fi r3.5,

ATTORNEY.

Patented Jan. 31, 1928.

UNITED STATES PATENT OFFICE.

ELI MAYNARD LONG. oEenNEvA, NEW YORK, AssIeNoE, `BY MEsNE ASSIGNMENTS,

To THE s'rANnAE-n or'rrcAI. ooiirrANY, OE eENEvA, NEW YORK, A CORPORA- TIONOF NEW YORK.

LENS-EDGING MACHINE. v

Application iled March 30, 1923. Serial No.i628,939.

This invention relates to a lens edging machine and in some respects, is similar to that set forth in my Patents Nos. 1,489,606 and 1,527,594, in that the rotary lens holder is disposed diagonally'of the plane of rotation of a rotary grinder toV bring the edge of the lens in contact with opposed faces of the grinder for lieveling both corners of the edge of the lens at the same time and is free l0 to move axially and radially by Contact of different portions of the edge of the lens with the opposed grinding faces.

The lenses to be beveled are y usually brought to the machine cut to approvimate ly the size required so that the onlyl work required by the machine is to grind the edge of the lens to the required bevel and finish.

Experience has proven that this finishing operation maybe produced by a certain number of revolutions of the lens against the grinder under a predetermined pressure sufficiently light to prevent breaking or chipping' of the glass and lwhile I am aware that certain devices have heretofore been proposed for automatically regulating the iinishing operation for a definite number of turns of the lens against thegrinder, as for example, the device shown in my Patent No. 1,527,594, previously Vreferred to, I have found Vthat such mechanism is somewhat complicated and delicate and not suiiiciently sturdy to withstand long contnued use.

The main object, therefore, of my present invention is to provide more simple, durable and reliable mechanism for producing the desired beveled finish during a predetermined number of revolutions of the lens against the grinder and to enable those revolutions to be varied at will according to the quality of the glass or for any other reason, by the use of simple adjustments which can be made at anv time during the operation of the machine or while the latter is at rest.`

In other words, I have discovered that by mounting the supporting frame for the grinder in certain relation to the lens holder andV to other parts of the machine, the said frame with the grinder' thereon may be automatically fed toward the lens-holder to` produce the desired finishing operation with less complicated and more dependable mechanisrn than has heretofore been practiced and, at the same time bring the adjusting means into more convenient position for manipulation, while the machine is in operation resulting in greatly increased output and accurate Vsizing and finishing of the lenses. i i

Other objects and uses relating to specific parts of the machine will be brought out in the following description. Y

ln the drawings: Figure l is a top plan, partly inrsection, of a lens edging machine embodying the various features of my invention. l

Figure 2 is a side elevation of thesame machine in which the lens supporting cary riage is shown by dotted lines as swung up-` wardly away from the grind stone.

Figure 3 is a horizontal sectional view taken yon line 3 3, Figure 2. p Figure l is a longitudinal vert-ical sectional view taken on line H, Figure 1.

Figure 5 is a. transverse vertical sectional view taken on line 5-5, Figure 1 y Figure 6 is a transverse sectional view taken on line 6 6, Figure l. Figure 7 is a detail sectional view of th lifting cam and `pawl for the lens holder frame, and Figure 8 is a detail sectional view of the notched disk and pawl for controlling the lifting pawl of the lens holder frame.

The main supporting frame may be. of any suitable construction, but as shown., coInprises a base 1" and Opposite upright brackets -2- rigidly secured to the rear portion of the base Mlin `transversely spaced relation and connected at their upper ends by cross bars -3- and -4-- and at their intermediate portions by additional cross bars -3- and -efor stife'ning and other purposes hereinafter described.

@Mader mechanism.

A horizontal cross shaft -'-5-. Figure 3. is journaled in suitable bearings -6-- on the rear portions of the brackets-2- in a plane some distance above the base 1- `andalso some distance below the cross vbar -4,

said bearings being provided with sleeves tov versely spaced relation for vertical rocking movement toward and from the base -1- and" directly over the central portion thereof, said arms--9 being eonnectednear their rear ends by a cross bar -10-k while their frntends are similarly connected by a cross bar l1-- directly over the front portion of the base l-, Figure 4, leaving a clear open space between the intermediate portions of the arms mainly for the reception of a rotary grinding stone presently described, and also to permit the Waste grindings and moisture commonly used in grinding to pass into or through the underlying base where it may be drained oif or collected for re-use in any desired manner not necessary to herein `illustrate or describe.

A horizontal cross shaft l2- is journaled -in suitable bearings i3-- on the intermediate portions of the arms 9- of the'supplemental frame .WS- parallel with the shaft -5- for receiving and supporting a rotary grind stone -14-, the latter being clamped by and between opposed collars -15- on the shaft l 2- to cause the grind stoneto rotate'vvith said Ishaft.

A pullev^16- is seeuredto one end of 'the shaft 1-54- andis adapted to be connected to any suitable source of power for transmitting rotary motion thereto, the 0pposite end of said shaft being provided with a tight pulley -17- which is connected by a belt `-18- to a pulley -19* on the corresponding end of the grinder shaft A2- for rotating the latter although it is evident that' other means for transmitting motion from the shaft -5 to the shaft -12- may be employed and that the ratio of speeds of said shaftsniay be varied as required.

The grind stone -14- is preferably composed of similar disks of abrasive material securedtogether face to face preferably with an interposed layer yof absorbent material such as blotting paper. and is provided with opposed beveled grinding faces -144 to form a V-shaped groove for receiving the edge of` the lens to be ground.

The supplemental frame E4-'- extends practically the entire length of the underlying base -1- while the grind stone shaft -12- is located some distance in front of the driving shaft -5- and with the grind stone thereon, is adapted to move bodily in an are of relatively long radius as the supplemented frame Hw8- is rocked about the axis of the driving shaft -5 in a manner hereinafter more fully explained.

Levis. supporting and driving mechanism.

A gear-worm -20' is secured to the driving shaft '-5- and meshes with a worm gear --21-` which together with a relatively long coaxial gear-worm Q.Q are secured to the intermediate portion of an upright shaft -2 Figurefl, the latter being our naled at its upper and lower ends in suit.- able bearings in the upper and lower cross bars -4- and -4-.

A pair of upright parallel guide rods 2% and 24V- are mounted in transversely spaced relation in suitable bearings in the upper and lower cross bars -ii-- and -3- for supporting and guiding a vertically movable carriage -25- and upon the intermediate portion of this carriage is journaled a relatively short cross shaft -26- to which is secured coaxially, a wormgear -27- and a spur gear -Q8- both located between the upright guide rods 24 and -2et, the worm gear-Q- being in mesh with the relatively long worm m22 for receiving rotary motion therefrom and transmitting the same to the shaft -2G- and spur gear -28-.

As shown in Figure 5, one of the u )right guide rods as -2L1- has a consi( erable length of its lower end threaded at 2Q-- and engaged in a threaded aperture 3,0-- in the corresponding side of the lower end of the carriage while the upper portion of the same rod is smooth and cylindrical and is passed through an opening -'-3lin the corresponding side of the upper end of the carriage to permit that end of the carriage to slide vertically thereon when the carriage is adjusted vertically by the rotation of the screw 29- which also serves to hold the carriage in its adjusted position.

The upper end of the guide rod -.2- is provided with a hand piece -32 by which it, together with the screw w29, may he rotated to adjust the carriage vertically.`

The opposite guide rod -'2-l-- is smooth and passed through apertures Ill-lm and Bebin the lower and upper ends respectively of the carriage so as to permit the latter to slide freely thereon when adjusted by the rotation of the screw -29--.

This carriage supports a sectional tranen upon which the lens holder is mounted and the object of its vertical adjustment is to permit the lens holder to he brought into grinding relation with the periphery of the grinder as the diameter of the latter is reduced by wear or rather, to permit the leus holder to be adjusted to grinders of dillercut diameters, the object of elongating the gearworm -22- being to maintain driving connection with the worin -2T- in the varions positions of adjustment of the carriage -25, it being understood that the smooth portions of the guide rods M24-aud -24- and the screw -29- are of suiicient length to allow the lens holder to be adjusted to coliform tothe maximum and iuiuimum radii of the grinder.

The supporting frame for the lens holder extends forwardly from the carriage over the grind stone las so as to support lll) the lens holder as nearly as possible directly over the axis of rotation oi' said grind stone and preferably consists of sections -35-- and -36-, one of which, as w35-, is centrally supported by pivotal trunnions 8T- on the lower and upper ends of the carriage to swing in a horizontal plane about a vertical axis, said trunnions being adjustable to retain the traine section mtirmly in place and are held in their adjusted positions by lock nuts -37-, Figure 4.

The other section B6- is pivotally supported at its rear end by studs 3S-d on opposite sides of the front end of the section 2.35 to swing vertically about a horizontal axis.

The lens holder preferably consists of a pair of coaxial spindles ,--SQfn and w459- journaled in suitable bearings ---lO--V and -40- on the front end ot the vertically swinging tame -36- andhave their adjacent ends provided with suit-able means for clamping a lens as ef/- between theni, one of said spindles as -39- being spring pressed toward the other by a coil spring -flL- to yieldingly hold the leus between the heads during the process or" grinding.

The lens holding spindles 9- and M39@- are actively disposed in a horizontal plane directly over the axis of the rotary grinder -llbut at an angle to said axis or rather diagonal to the plane of rotation of the grinder so as to hold the lens edgewise against both vof the opposed grinding faces -lltm for simultaneously beveling both corners of the edge of the lens in a manner somewhat similar to that set forth in my Patent No. 1,527,594 previously referred to.

The outer end of the spindle -39- is provided with a spur gear 42- meshing with a relatively smaller spur gear H43- on the corresponding end of a spindle ill- Which is journaled in the traine section -36- just back of and parallel with the spindles -39- and Pf39f and to which rotary motion is transmitted yfrom the spur gear 28- through the medium of a train of gears -t5- and -45-, Figure 3.

As illustrated, the gears 45'd are mounted respectively upon the shaft le/l and an additional shaft -44- both ot which are journaled in the trame section -36- between the frame section -35 and lens supporting spindles. i

The other two gears 45 are mounted respectively upon suitable shafts 46- and m46@- which are journaled in suitable bearings .on the frame section 35- at opposite sidesot the pivotal studs 38- connecting the ytwo frame sections and -36.

The supporting shafts for the gear train in cluding the supporting shaft m2-- t'or the worm-gear m27 and the pivotal studs the shaft lilito break connection with the gear 45H on the shaft e46- when the frame section --36- is rocked upwardly to a: substantially vertical position away from the grind stone in a manner hereinafter described, and thereby to stop the rotation ot the lens holder while the remaining parts of the driving mechanism therefor continue to rotate.

A lens pattern -ll is secured to the outer end of the spindle B9- to rotate therewith against a suitable stopor pattern rest 48M which is mounted upon one end ot' a lever 19-, the latter being pivoted at ---5O-a to the v:trame section n35-'to swing vertically and having its rear end normally resting against the underside oit t the adjacent portion ot the frame to hold the iront end against undue downward displacement and permitting the rest 48M to be adjusted vertically by any suitable means similar vto that settorth in my Patent No. 1,527,594 for determining the size oi the linished lens. I

The mounting of the pattern rest 48e upon the lever 49+ in the` manner described permits the front end of said lever with pattern rest thereon to be rocked up-Y wardly by hand to contact with the pattern as the supporting section -36- for the lens holder is roclred downwardly toward the grindstone so that by supporting the front end of the lever in one hand, the operator may carefully lower the lens holder toward the stone and determine, by the sense of reeling, when the Vedge of the lens contacts with the stone to avoid any sudden impact between those parts which might injure the lens. v f f Automatic feed for grindstonc carriage.

As previously stated, the lenses to be ground are cut to approximately the desired size and form so that it is only necessary los Illia termined number of revolutions of the lens y against the stone according to the quality of the glass 'from which the lens is made and for this purpose,suitable means is provided for 'feeding the grinder supporting carriage a definite distance toward the. lens holder for eachl revolution ot said lens holder and also 'for stopping` and automatically lifting thel lens holder awey from the grindstone at the end of a predetermined number of revolutions of the lens holder.

To this end, the lower end of the rear upright shaft Q3- is provided with an eccentric bearing -5ladapted to engage one arm of a bell cranl; lever 52 which is pivoted at #53- to the underside of the cross bar -3-- to swing in a horizontal plane about a vertical axis and has its other end extended through. an opening -tin the adjacent side of the bracket -2- and pivotally connected to the rear end of a. forwardly extending pawl The lever --52 projects into the path of movement of the eccentric 5l at one side thereof, to be operated thereby against the action of a retracting spring -56-- but is free to move away from said eccentric independently thereof, said spring being connected to the pawl -55- and also serves as a. retracting means therefor.

The front end of the pawl extends beyond the front edge of the grinder and is adapted to engage the teeth of a ratchet wheel 57'- which is secured tothe outer end of a. horizontal cross shaft -58-, the latter being journaled in suitable bearings 'in opposite sides of the carriage-8- at the front of the grindstone -lt-and directly over the frontend of the base -1-.

A spiral cam -59- is secured to the intei-mediate portion of the shaft -58- to ride against the periphery of a hardened Vbearing -60- which, in this instance, consists of a steel rod secured crosswise to and within the upper portion of the front end of the base --ldirectly under the shaft --553-- whereby the carriage -S- will be gradually raiseda distance equal to the throw of the cam during each revolution thereof. from the shorter radius of contact with the bearing --60- to the longer radius.

A pand-tripping plate -61- is mounted for angular adjustment on the hub G2- of the ratchet wheel -57- in close proximity to the outer face thereof so as to roch freely thereon and is provided with a laterally projecting peripheral flange vor lip -63- extending across the teeth of the ratchet wheel to engage and trip the pawl at the end of each revolution of the cam -59- at about the same time the low point of the cam engages the bearing -GO- so as to stop the further rotation of the shaft at the end of each revolution thereof, the circumferential length of the flange -63- being substantially equal to and slightly greater than the maximum distance of lengthwise travel vof the pawl -55- to enable said pawlto slide back and forth thereon while the low point of the cam is registered with said bearing.

The plate or disk -61 is also provided with a slot 6ft- J concentric with the axis of the shaft -58 for receiving a stud -65- on said ratchet wheel and allowing a limited angular adjustment of the plate by hand to shift the flange -t3 forwardly from the pawl -55- and thereby permit the pawl to re-engage and rotate the ratchet wheel, said stud -65- being connected by a spring -66- to a laterally projecting shoulder -67- on the plate for automatically ret-racting the plate angularl'v when released.

The relation of the eccentric 1-, lever -52--, and teeth of the ratchet wheel m57- is such that when thi` maximum throw of the eccentric --5l-u is imparted to the lever --52-1 it will more the pawl 55-a endwise, a distance suliistantially V, ual to a certain number of, say three teeth of the ratchet wheel -5i'-, whereby the ratchet wheel will be adjusted angularly the circumferential distance of three teeth at each revolution of the shaft -23- thereby moving the grindstone carriage toward the axis of the lens` holder a definite amount for each revolution of said lens holder by reason of the fact that the angular adjustment of the shaft 5S- with the cam -59- thereon, as compared with the speed of rotation of the lens holder, is relatively slow.

That is, the driving connections between the shaft --23- and lens holder and between the same shaft and cam shaft --Sm are ad justed to establish a definite minimum ratio of rotation between the lens holder and cam shaft of, say forty revolutions of the lens holder to one revolution of the cam shaft,

which means that the grinder carriage --Q.-- would be gradually moved toward the axis of the lens holder a predetermined distance corresponding to the i'naximum throw of the cam 59mduring forty revolutions of the lens holder against the grinder sufficient: to produce the desired beveled finish of theedgc of the lens at which time, the flange -63- will have tripped the pawl 55* to stop the further rotation of the cam shaft'lwith the lovT point of the cam resting on the bearing -'(30.y

Suitable means is provided for varying this speed ratio of the lens holder and cam shaft by varying the amount of lengthwise movement of the pawl 555- and for this purpose, is provided a relatively short vertical shaft G8-- journaled in suitable bearings -69- on one side of the grinder carriage 8- and provided with a hand piece -70 by which it may be rotated.

The upper end of the shaft -68- is provided with an eccentric pin -7l-` extending into a longitudinally elongated slot -72- of sufiicient length to allow the maximum forward movement of said pawl against the action of the reti-acting spring -56-, so that when the eccentric 51; on the lower end of the shaft -23- is at its maxi mum distance away from the adjacent end of the lever-45%, the pin -7l will be enga d with the front wall of the slot 72.

t is now evidentthat rocking the hand piece 70- rearwardly from the position shown in Figures l and 2, will cause a similar -angular adjustment of the eccentricv 7l-- which will allow the spring -56- to retract the pawl and its operating lever 52- for the purpose of moving the pawl agreater distance and imparting a correspondingly greater angular movement to the rachet wheel -57- and cam 239-0- whereby the grinder carriage will be moved toward the grinder a greater distance at each revolution of the lens holder resulting in the beveled finishing ofthe lens with a less number of `turns of the lens holder during one complete revolution of the camV shaft -58.-, the adjustment of the throw or the movement of the pawl being determined by the quality of the lens or by the number of revolutions of said lens against the grinder to produce the` desired beveled finish.

Lens holder lifting mechanism;

Secured to the cam shaft --58-- is a circu! lar disk T3- having a peripheral notch' -74 adapted to receive the front end of a rearwardly extending `reciprocatory bar m75- whieh is guided in suitable ways on the cariage -8- radial to. the shaft-58- and has its rear end pivotally connected tof -79- having its rear. end connected to ag crank arm 80- on an upright rock shaft -81- at the rear of theaxis of the grindstone shaft -12--.

The shaft -V8lhas its lower end ,sta tioned in a bearing S2-,- and its upper end riage -35 relatively close to its axis of ``movement on the trunnions -37--- The extreme upper end of the rock shaft -81- isprovided with-a crank arm w84- which projects forwardly some distance beyond the shaft 4G- for side thrust engagementWith the rear end of a lifting pawl -85-, the latter being pivoted at S6- to the under side of an overlying portion j of the frame section -36- to swing in a ppawl *85* when the latter is shifted lat- @rally intovthe paththereof for rocking the frame section 36- and lens holder carried thereby, upwardly about the axis of the pivotal studs -38- to approximately a vertical position for interlocking engagement t vend -8-, are operated to release the pawl *'85- by means of a retracting spring 924- which also exerts a forward endwise pressure upon thejpawl -75- to hold it in engagement with the periphery of the notched disk -73- as the shaft 5S- is rotated by the pawl -55- and ratchet wheel -57- and to force the forward end `of the pawl -75- into the notch 74- of said disk when registered with the pawl. Y

That is, the high point of the cam -59- and notch -74-- have a definite circumferential or angular relation to each other whereby the notch *7awill be brought into registration with the adjacent end of the pawl-75 to cause the lifting of the lens holding vsection -36- away from the grindstone at about the same time that the high point of the cam--59, registers withthe bearing-O- or at the end of each revolution of the shaft -58- at which time, the frame section -36- will be rocked upwardly to the position shown by dotted lines in Figure 2, thereby breaking connection between the gears on'the shaft alfand -46- and consequently stopping the rotation of the lens holder. i

The disk -6l is adjusted to bring its tripping member' -63- for the pawl-'55- into a definite' circumferential relation or angle to the high point of the cam 594- so as to trip said pawl out of engagement `with the ratchet wheelat the end of each revolution of the shaft -58 or when the low point of the cam -59-is registered with the bearing GO- 'thereby stopping the further rotation of the ratchet wheel -57`- and allowing `the front end of the pawl to simply ride back and forth upon the lateral offset -63- without performing any work. It is now evident that when the low point of the cam -59- is registered with the `bearing 60-, Athe lens holder will be at rest in an elevated position while the shaft --58- and parts carried thereby will also be at rest.

This lifting and point of the Vcam --59-.- rides against the latching: of the lensV Y holder away from the grinder as the high l bearing ,-460- is comparatively quick ovv ing to the useot two lifting aWls -87- and the relatively higher spee of rotation of the shaft 46- as compared with that of the cam shaft -58- and then vas the point of contact of the cam -59- With the bear ing -60- shifts from the high point to the low point, the pawl m75- will be forced endwise out of the notch t-`71- by engagement with the periphery of said disk v73-a and will thereby allow the paWl-S- to be Withdrawn out of the path of movement of the cam -87- by its spring and permit the lens holder to be restoied to its grinding position -9land at the saine time, the

tripping member -fGB-f will have been moved forwardly to trip the pawl -55- and to hold it in its tripped positionuntil the disk 61- is advanced by hand to permit ie-engagement of said pa-Wl with the teeth of the ratchet Wheel.

As soon as the support for the lens holder is lowered to its grinding position, the disk -Ul is advanced or adjusted for- Wardly by hand against the action of the spring -66- to permit the aivl to reengage and rotate the ratchet iv ieel to cause a repetition of the cycle oi" operation, the disk -G1- being released. and `returned against the stop pin at the beginning of each cycle.

`The stroke of the kpawl may be varied by adjusting theY position ot the eccentric pine-7 1- throughthemediuin of the hand piece n70- Which limits the rearward stroke of said pawl by engagement of the pin w71+- With the front wall of the slot 72, it being understood that the pawl -5- is yieldingly held against the stop 7lby thespring -56- and that When the paWl is held by the stop 7lagainst its maximum rearward movement, the reararm ofthe lever -52- Will `be similarly held against its extreme inward movement toward its opera-ting pin 5lon the shaft e225- wherehy the arc of movement of the` lever -52- will depend upon its proximity to the eccentric pin 5l- When the latter is at its point oi revolution most remote from said lever.

By this adjustment, the pawl 5S-f may be caused to operate the ratchet Wheel 57'- one-tooth space, two-teeth space or three teeth space according to the amount ot vertical adjustment of the grindstone carriage -8- which may be necessary for each revo lution of the lens holder to complete the grinding operation by a predetermined num-y ber of revolutions` of said lens holder, at each complete revolution of the cani 553- Whereupon the lens supporting frame section connections with the lens holder brokenzaiid at the same time, the tripping member the pawl f'-55- to stop the lifting opera-V tion of` the cam -59- upon the grindstone supporting carriage .-8- ready for a repetition of the operations previously described.

I claim:

l. In a lens edging inacliine,.a rotary" grinder having opposed co-axial grinding faces, means for rotating the grinder, a`

end ot a predetermined number of revolutions of said lens holder.

i2. ln a lens edging machine, a rotary grinder having opposed co-axial grinding faces, means for rotating the grinder, n

rotar lens` holder in rrindinff relation to the grinder, nieaiisifor rotating the lens holder, means for moving the grinder toward the lens holder' a pre-determined dis-` tance for each revolution of the lens holder and means ior lifting the lens holder away fronitlie grinder when the grinder is moved a certain distance toward the lens holder.

3. In a lens edging machine, a rotary grinder having opposed co-axial grinding faces, means for rotatin'T the grinder, a rotary lens holder in grinding relation to the grinder, means for rotating the lens holder, means Aitor moving the grinder toward the lens holder a. predetermined distance for cach revolution of the lens holder, and means for snpportingthe lens holder so that it may automatically shift axially by contact of the lens With the Grinder.

4. In a lensbedging machine, a rotary lens holder, a support for the lens holder, a rotary grinder, a support for the grinder hinged to swing about an axis4 parallel with that of the grinder to move said grinder toward and from the lens holder, and iiieans for rocking said grinder support about its axis lllf) toward the lens holder a definite alnount for 1i each revolution of said lens holder.

horizontal axis, a rotary grinder Journaled on the support intermediate its ends, a rogrinder, :i rotary cam engaging the other endof the lgrinder support for rocking the A same to feed the grinder toward the lens -tai'y lens holder in grinding relation to the holder, means for rotating the lens holder,

and means for rotating the cani a definite amount for each revolution of the lens holder.

G. In a lens edging machine, a rotary lens holder, a movable supporttherefor, means for rotating the lens holder, a rotary grinder, i

asupport` for the grinder movable toward ,the lens holder, a rotary cam for feeding-the` grinder support toward the lens holder, means for rotating the cam a deiinite amount for each revolution of the lens holder, andy means ior rotating the grinder.

7. In a lens edging machine, a trame, a ro tary shaft mounted on the frame, means for rotating` the shaft, a carriage hinged to swing about the axis of the shaft, a rotary grinder mountedon the carriage, a rotary lens holder, a support for the lens holder movable toward and from the grinder, a cam -for rocking the carriage to move the grinder toward the lens support, means for transmitting rotary m0- tion from the shaft` to the grinder, additional means for transmitting rotary motion from the shaft to the lens holder, and means for transmitting rotary motion from the shaft to the cam.

8. In a bevel-edge lens grinding machine a rotary grinder having opposed peripheral grinding faces, a support for the grinder movable about a horizontal axis some distance from and parallel with the axis of' the grinder, a rotary lens holder extending diagonally across the upper face of the grinder Vwith the lens in Contact with both of the grinding faces at one and the same side of its axis of rotation, and means synchronized with the rotation of the lens holder for raising the supporting frame for the grinding element toward the lens holder as the lens is ground away.V f

9. In a bevel-edge lens grinding machine a rotary grinder having opposed peripheral grinding faces, a support for the grinder movable about a horizontal axis some distance from and parallel with the axis of theA ment toward the lens holder as the lens isground away, and a supporting frame for the lens holder movable about a vertical axis between the axis of the grinding element and the axis of movement of the supporting frame for said grinding element.

10. In a lens edging machine, a `rotary grinder, means for rotating the grinder, a rotary lens holder, means actuated by a part of the grinder-rotating means for rotating the lens holder, additional means including a rotary cam actuated by a part or' the grinder-rotating means for moving the grinder toward the lens-holder a delinite amount for each rotation o said lens holder, and means for stopping the rotation of the cam at the end of each revolution thereof.

1l. In a lens edging machine, a rotary grinder, means'for rotating the grinder, a rotary lens holder, means actuated by a part ot the grinder-rotating means for rotating the lens holder, additional means including a rotary cam actuated by a part of the grinder-rotating means for f moving the grinder toward the lens-holder a definite amount for each rotaton of said lens holder, and means for lifting the lens holder away from the grinder at the end of each revolution of the cam. y

12. In a bevel-edge lens grinding machine, a rotary grinder having opposed peripheral grinding faces, a supporting frame iior the grinding `element movable about a horizontal axis some distance from and parallel with the axis of rotation of the grinding element, a rotary lens holding element and a supporting frame therefor movable about a vertical axis in substantially the plane of rotation of the grinding element.

13. In a bevel-edge lens grinding machine, arotary grinder having opposed peripheral grinding faces, a supporting iframe for the o'rindino' element movable about a horizontal C C axis some distance from and parallel with the axis-ot rotation of the grinding element,

a rotary lens holding element and a supporting trame therefor movable about a vertical axisv in substantially the plane of rotation ot the grinding element, and means synchronized with the rotation of the lens holder for moving the supporting frame for the grinding element toward the lens holde as the lens is ground away.

141-. In a lens edging' machine, a frame having a bearing near one end, a grinder supporting carriage hinged to the opposite end ci' the frame to swing toward and from said bearing, a rotary cam journaled on the carriage to ride against 4said bearing for moving the frame away from the bearing, a rotary grinder journaled on the carriage, means for rotating t-he grinder, al rotary lens holder, a support for the lens holder movable by contact ol the lens with the grinder as the latter is moved with the carriage, means actuated by a part oi the iirst named means Jfor rotating the lens holder, and means actuated by a part of the first named means for rotating t-he cam. i

15. A lens edging machine as in claim 14 in which means is provided for stopping the rotation of the cam at the end of each revolution thereof.

16. A lens edging machine as in claim 14 in which means is provided for lifting the lens holder away from the grinder at the end of each revolution of the cam.`

In witness whereof I have hereunto set my hand this 19th day of March 1923.

f .ELI MAYNARD LONG. l

llO

CERTIFICATE OF CORRECTION.

Patent No. 1,657,720. Granted January 31, 1928, to

ELI MAYNARD LONG.

It is hereby certified that the above numbered patent was erroneously issued to "The Standard Optical Company, of Geneva, N. Y., a Corporation of New York", whereas said Letters Patent should have been issued to Shur-On Standard Optical Company, Ine., of Geneva, N. Y., a Corporation of New York, said Corporation being assignee of the entire interest in said inven tion", as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 13th day of March, A. D. 1928.

M. J. Moore,

Seal. Acting Commissioner of Patents. 

